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SDK to implement Numaflow Source or User Defined Functions or Sinks in Java.

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package io.numaproj.numaflow.reducestreamer.model;

import lombok.Getter;

/**
 * Message is used to wrap the data returned by Reduce Streamer functions.
 */
@Getter
public class Message {
    public static final String DROP = "U+005C__DROP__";
    private final String[] keys;
    private final byte[] value;
    private final String[] tags;


    /**
     * used to create Message with value, keys and tags(used for conditional forwarding)
     *
     * @param value message value
     * @param keys message keys
     * @param tags message tags which will be used for conditional forwarding
     */
    public Message(byte[] value, String[] keys, String[] tags) {
        this.keys = keys;
        this.value = value;
        this.tags = tags;
    }

    /**
     * used to create Message with value.
     *
     * @param value message value
     */
    public Message(byte[] value) {
        this(value, null, null);
    }

    /**
     * used to create Message with value and keys.
     *
     * @param value message value
     * @param keys message keys
     */
    public Message(byte[] value, String[] keys) {
        this(value, keys, null);
    }

    /**
     * creates a Message which will be dropped
     *
     * @return returns the Message which will be dropped
     */
    public static Message toDrop() {
        return new Message(new byte[0], null, new String[]{DROP});
    }
}